http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 구랑모 (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
-
1.0- 2.5MeV 전자가속기를 이용한 대기 중에서 전자빔에 의한 탄소강의 표면경화
박성민,장창환,구랑모,Golkovskii, M,Korchagin, A,Kuksanov, P 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.7
Surface hardening of carbon steel by electron beam in the atmosphere was carried out using an 1.0∼2.5MeV electron accelerator. The electron beam energy used was 1.4MeV, and the power density of the beam was about 10⁴kW/㎠. The sample piece was rotated and translated during irradiation, so that the point of irridation on the steel surface changed continuously. When the electron beam impinged on the surface, the irradiated area melted very quickly and cooled rapidly owing to the large heat sink provided by the bulk of the steel material. The cooling rate was so fast that the melted area was mostly transformed into martensite phase(or a bainite phase in a limited part) during the self-cooling. The surface hardness of the carbon steel changed from approximately 250Hv to 700Hv, on the Vickers scale. The maximum hardened depth was l.6mm. The melting and cooling times were so fast that oxidation of the steel surface was almost negligible, even though the sample was always in the atmosphere. This method can be applied to heat treatment of steel surfaces for many industrial purposes, owing to its high treatment rate and simplicity.
-
이성학,권동일,서동우,구랑모,김방광 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.8
The present study is concerned with the microstructural analyses of the surface layer hardened by the irradiation of accelerated electron beam in 0.2% and 0.4%C plain carbon steels. Steel specimens were irradiated using an 1.4 MeV electron accelerator, and the microstructures of the irradiated surface regions were examined. Upon irradiation, the ferrite-pearlite matrix adjacent to the specimen surface was changed to the ferrite-martensite structure, whose interface was composed of fine particles and needle-like lamellae. In order to investigate the martensitic transformation mechanism, the simulation test including thermal cycles of abrupt heating and quenching was carried out. It was found from this test that the temperature of the irradiated surface layer was raised to about 1100℃, which was enough to obtain the surface hardening through the transformation from pearlite to martensite. It is also suggested that the proper accelerated electron beam conditions such as the carbon content and the heat input should be determined to improve microstructures for the surface hardening.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
